Improved extension-ladder



dilated tat-ra ARTEMAS RIO-GERS, `vO11" PANSVILL'E, ILLINOIS.

Letters Patent No. 93,642, dated August 10, 1869.`

IMPROVED EXTENSION-LADDER.

The Schedule referred to in these Letters Patent and. making part of the same. l

' To 'all whom it may concern.-

` Be it known that I, ARTEMAS Roenes, of Panesviile, inthe .county of Lakeand State of Illinois, have invented a new and useful Improvement in Extension-Ladders; and that the following description, taken in connection with the accompanying plate of drawings, hereinafter referred to, form a full andexact specification of the saine, wherein I have set forth the nature' and principlesof my said improvement, by which my'invention may be distinguished from others of a similar class, together with such parts as I cla-im, and desirepto have secured by Letters Patent.

My invention relates to that class of ladders commonly known as extension-ladders; and consists in certain modications of the details of the same, and a novel airangement of mechanical devices, whereby the said ladder 'may be extended and lowered with the greatest facility, or adjusted at the. requisite height, by means of hooks attached to the rungs or rounds of the said ladder, and a cord passing through a circular slot in the rungs aforesaid.

. In the accompanying plate of drawings, which illustrates my invention, and form a part of the speciiication thereof- Figure l is a front elevation, showing the ladder partially extended. A Figure 2 .is a section taken inI the line A B of fig. 1.

Ihe said ladder is constituted in two parts or members, marked, respectively, A and B.

Thelower member is provided with rungs or steps, C, of the usual form, and shafts, D DD", of cylinf drical form, having their bearings in the circular slots E in the standards F.

The lower shaft D is furnished with the crank G, of the usual form, by means of which it may be revolved in its bearings.

Through the centre of the shaft D', and to the right ofthe centre of shaft D, arecut the circular slotsfH A line, I, of suitable flexibility and strength, is rove through the said slot H of the shaft D aforesaid, arid made fast thereto.

It.to wit, the line aforesaid, is then led upward between the rungs C, ofthe lower member B, and the rungs K, of the upper member of the said ladder; thence, through the circular slot H of shaft D; thence,

.to thel rear and over the roller D; thence, to the lower member, and is secured in position by means of the guide-plates L, which are bolted flush with the inner side of the standards F, and bent at right angles to tit the contour ofthe sides of the said upper meinber.

To the shaft D', which has its lbearings atEin the standards F, are` secured the hooks M, the said hooks being made to circumscribe the periphery of the said shaft, and bolted securely thereto.

The said hooks are provided with a iiexible shield or shields, N, which pievents the said khooks from catching in the clothes of the operator, and also causes them to recede when the ladder is lowered, as will be hereinafter fully described.

Having thus designated the component parts of my invention, I will proceed to describeJ its operation.

p The upper member A, so constituted, as aforesaid,

tol slide easily within the standards F of the 'said lower membenand the guide-plate L of the same, is-secured 'in position by the hooks M, in the 'manner following,

to wit: y

The said hooks, having been secured, as aforesaid,

to the loose round or roller D,are held in position nearly at right angles to the direction ofthe said lad-- der, by the force of tension exerted by the cord I,

which passes through the circular slot H.

lVhen the said upper member of the ladder israised, the rungs or rounds of the same press upon the under curved side of the hooks M, and cause the said hook to revolve withits axis the roller D' to such an extent as to allow the said rungs to pass upward.

When the said upper member is lowered,'the said rungs press downward upon the shield N, hereinbefore described, causing the said hooks to describe a partial revolution, and to oii'er no obstruction -to the descending upper member aforesaid.

In order to secure the said upper, member in any position within theseope of its movement, the same is raised, in the manner aforesaid, until the desiredA height is'reached. -A round of the said upper niember is then made to catch between the shield N and hook M. The said upper member is then slightly lowered, and the said rung rest-sA upon and is firmly held by the hook M.

Having thus described my invention, I will set forth my claim, in the following clause: v

I claim, and desire to secure by Letters Patent, the hook M, with its shild N, in combination with the rope I, and rollers D, and the roller D', with the circular slot H', arranged and constructed substantially as herein described, and for the"purpose set forth.

ARTEMAS ROGERS.

- Witnesses:

JNO. L. BRANCH, E. HUNTINGTON. 

